Saw-sharpening machine



(No Model.)

2 Sheets-Sheet 1. C. ROGERS.

SAW SHARPENING MACHINE.

Patented July 2l, 1896.

1w mams mens co Pn Y mm Attorney.

(No Model.) v 2 sheetssheet 2. S. C. ROGERS.

SAW SHARP'ENING MACHINE. No. 564,394. y Patggted July 2l, 1896.

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Witlnesses: Inventop 5MM/ C. /f'fzvv K Attorney.

UNITED STATES- 'PATENT OFFICE.

SAMUEL O. ROGERS, OF BUFFALO, NEV YORK.

-SAw-sHARPl-:NlNG MAG-'Hm E.

SPECIFICATION forming part oen-.eters Patent No. 564,394, dated July 21,1896.

Application led September 18, 1894. Serial No. 523,397. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL C. ROGERS, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented certain new and useful Improvements in Saw-Sharpening Machines;

'and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference beinghadto the accompanying drawings, and to figures of reference markedthereon, which form a part of this specification.

My invention relates to that class of sawsharpening machines which areadapted for operation upon the teeth of band-saws, its object being toso construct and combine the operative parts of the machine as to adaptit for continuous and automatic sharpening action upon the teeth of theband-saw for any depth of throat and for any shape of tooth.

To this end my invention consists, first, in improved means for holding`the band-saw while being fed and sharpened and for drawing it down toplace; and, second, in an improved form of pivoted frame for carryingthe revolving emery-wheel, provided with means for adjusting theposition of the emery-wheel with relation to the depth of throat and theshape of the front and back edges of the teeth.

In the drawings, Figure 1 is a top plan view of my improved Sharpener.Fig. 2 is an inner face view of the front wall of the main frame. Fig. 3is a front elevation of the Sharpener, and Fig. 4is a partial endelevation showing adjustment vof pivoted frame carrying revolvingemery-wheel.

Referring to the drawings, 1 is a horizontal shaft j ournaled in theupper part of the framework 2. Upon the outer end of this shaft aremounted the fast and loose pulleys 3 and 4 for the reception of thepower-belt. (Not shown). At the inner end of this shaft is rigidlysecured the grooved pulley 5, and 6 is a Aworm 0r screw integral withthe shaft upon its central portion.

. Below the shaft 1 and j ournaled in the framework, at right angles tosuch shaft, is the shaft 7. A worm-wheel 8 is mounted upon the shaft 7 just under and in engagement with the worm 6 upon the shaft 1, and uponthe opposite or front end of the shaft 7 is mounted the disk 9.Dovetailed in the front face of this disk is the block 10, which isdiametrically adjustable in such disk and secured in any positiondesired by the set-screw 11. On the inner side of the front wall 12 ofthe frame 2 is loosely dovetailed a plate 13.

An adjustable connecting-rod 14 is pivoted at one end to the disk 9 andat-the other end is centrally pivoted at the lower edge of the plate13,l and by this connecting-rod 14 the plate 13 is horizontallyreciprocated in its bearing in the front wall. On the outer face of thefront wall 12 is arranged the horizontal ledge 15, `(see Fig. 3,) uponwhich'the bandsaw 16 to be sharpened rests. This ledge 15 has thedownwardly-projecting slotted eXtensions 17 by means of which inconnection with the bolts 13 the ledge 15 is vertically adjustable. Ateither end of this adjustable ledge is secured the vertical rollers 1919, which serve to hold the saw 16 upon the ledge.

2O is an adjustable arm pivoted near its lower end to the front wall andcarrying at its upper end the wheel 21, which bears against the saw 16at a point near which it is being sharpened for the purpose of steadyingthe saw at that point.

It will be noticed that the rod 2O is inclined slightly to the left orin the direction in which the saw is being fed. This, as the saw-blademoves, causes a slight bearing-down contact of the wheel 2O with thesaw, which tends to assist in holding it down while being sharpened.

' The saw is intermittently fed forward to the left by means of thefeed-finger 22, pivoted at 23 to a projection 24 upon the reciprocatingplate 13. The outer end of this feedfinger 22 is bent inwardly, as at25, to engage with 'the front edges 26 of the teeth of the saw to feedit forward, which is accomplished as follows: Rotary motion beingimparted to the shaft 1, its worm 6 revolves the wormwheel 8, whichcauses its shaft 7 to turn and with it the disk 9 at its other end. Theconnecting-rod 14, adj ustably pivoted to this disk and to the plate 13,causes said plate to reciprocate in its bearing in the front wall 12. Asthis plate is moved to the left the bend 25 at the outer end of thefeed-finger 22, pivoted to the plate 13, engages with the front face 26IOO of a tooth in the band-saw and pushes it forward a distance equal tothe throw of the plate 13, and as the plate travels back the bend 25 ofthe feed-finger 22 rides up the back face 27 of the neXt tooth and dropsover in engagement with the front face of this tooth to again feed thesaw forward, as before. In this manner the saw is intermittently fedforward as desired to have its teeth sharpened. By shifting the positionof the diametric arm 10 in the disk 9 and adjusting the length of theconneeting-arm 14 the intermittent feed of the saw can be varied asdesired to adapt it for different sizes of teeth to be sharpened.

The sharpening apparatus employed in connection with the feeding devicejust de scribed is arranged as follows: 28 is a fiat frame provided atits rear end with the two extensions 29 29, which are pivoted to themain frame so as to give to the frame 28 an inclination, as clearlyshown in Fig. 3.

30 is a short shaft pivoted in the bearings 31 31 in the front of theframe 28. Upon the outer end -of this shaft 30 is mounted theemery-wheel 32 and between the bearings 31 31 is mounted the groovedpulley 33. A cord or belt 34 passes over this pulley 33 and the pulley 5upon the shaft 1, and thus the revolution of the shaft 1 causes theshaft 30, carrying the pulley 33 and emery-wheel 32, to revolvesimultaneously with the feeding operation before described to effect theautomatic sharpening of the teeth.

The movement of the pivoted frame 28, carrying the emery-wheel 32 duringits grind ing contact with the faces of the teeth, is controlled asfollows: The depth of the cutting action of the revolving emery-wheel,which is limited by the throat of the saw being sharpened, is regulatedby the screwthreaded rod 35 adjustable in the frame 28 and a similar rod36 secured to the main frame and against which the rod 35 impin ges asit descends, thus limiting its downward movement, and 37 is a spiralspring interposed between the thumb-nut 38 upon the rod and the frame 28to act as a cushion and prevent the rods 35 an d 36 from coming togetherwith sufficient force to mar their meeting ends.

39 is a yoke pivoted to the under side of the frame 28 and carrying uponits outer end 40 the roller 41. This roller is adapted for engagementwith a pivoted incline 42 secured to the reciprocating-plate 13. Itsinclination is regulated by the adjustable pin 43. An adjusting-screw44, passing down through the pivoted-frame 28, is adapted for contactwith the yoke 39 to permit the adjustment of this yoke and its roller 41and provide additional means for regulating the distance which the frameshall rise when the roller travels up the incline. When the incline 42moves forward against the roller 41, it gradually raises the emery-wheelin the frame 28, causing it to grind oif the back edge 27 of the tooth,the

inclination of the cut being regulated by adjusting the angle of theincline 42.

The upper bearing-surface of the incline 42 is straight, as shown, togrind teeth with straight backs, but it is apparent that by changing thebearing-surface of the incline to a concave, convex, or otherconfiguration a similar' edge will be cut on the back of the tooth.

I claim-- f.

1. In a saw-sharpening machine, the combination with means for grindingthe sawteeth; of the saw-blade-holding devices consisting of avertically-adjusted ledge on the front wall of the frame, rollersthereon between Which and the frame the blade is held, an upright armpivoted at its lower end to the frame and inclining slightly toward thatend thereof toward which the blade moves, and a wheel journaled on theupper end of said arm and bearing against the outer face of the blade,said wheel standing in a plane at a slight angle to the horizontal, asand for the purpose set forth.

2. In a saw-sharpening machine the combination with the main frame anddrivingshaft, the saw-feeding devices connected with said shaft and thesaw-holding devices; of the tilting frame pivoted to the main frame, thegrinding devices carried thereby and connected with said driving-shaft,a threaded rod adjustable through said tilting frame, a coiledcushioning-spring thereon, a second threaded rod on the main frameagainst which the first rod impinges, and a thumb-nut on this rod at theend of said spring; and means substantially as described for causing therise and fall of the pivoted frame, as and for the purpose set forth.

3. In a saw-sharpening machine the combination with the main frame anddrivingshaft, the saw-feeding devices connected with said shaft and thesaw-holding devices; of the tilting frame pivoted to the main frame, thegrinding devices carried thereby and connected with said driving-shaft,a threaded rod adjustable through said tilting frame, a coiledcushioning-spring thereon, a second threaded rod on the main frameagainst which the first rod impinges, and a thumb-nut on this rod at theend of said spring; a yoke pivoted to the tilting frame and carrying aroller at its outer end, a set-screw through the frame onto the yoke,and an adjustable incline carried by said saw-feeding devices andadapted to make contact with said roller, as and for the purpose setforth.

4. In a saw-sharpening machine, the combination with the main frame anddrivingshaft, the saw-feeding devices connected with said shaft, and thesaw-holding devices; of

the tilting frame pivoted to the main frame,

the grinding devices carried thereby and connected with saiddriving-shaft, a threaded rod adjustable through said` tilting frame,and a second threaded rod on the main frame IOO IIO

against which the first rod impinges; a yoke In testimony whereof I havesigned my pivoted to the tilting frame and carrying a. name to thisspeoioation in the presence of roller at its outer end, a set-screwthrough two subscribing Witnesses.

the frame onto the yoke, and an adjustable SAMUEL C. ROGERS. incline.carried by said saw-feeding devices Vitnesses:

and adapted to make Contact With said roller, WV. T. MILLER,

as and for the purpose set forth. S. J. HARRIS.

